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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a57af186b599451fb60a5c77f3110cadec13826933fd1679c16098138242ed01' 
  AND token = 'Zs9qFGSenbxcrNtAHHHhWAVluNMSQwSvg1/EfLscDYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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