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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0752b23ba62972079eb811cd69814802b014c14d6eb50fb102829b754aa558d0' 
  AND token = '7bG/BTU2l9a8Vka7slpmKlvSMBBOp4j3fqe15RGluWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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