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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a0ac3980686c4a9450535cb4247fd3ba5b8de8706e5ec23d5b7452e226a1b8' 
  AND token = 'Cn4DjkUUAso6t36niJhMCB8fNR1yuNPiM68QapJiXOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}