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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6fa55839d14c857714f4be0da245e8c879fae56188fe92c07d033654d8bf6a' 
  AND token = 'zDPrbcV2zXi4oRHEgpSHM5Y4LRvdHlKmaJINb8Ujw2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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