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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56706ea48d2aef40170fd1122a887ff5390d8185ebd63f913775840ba7065468' 
  AND token = 'JG9XtcFwJB51pfEL12eB6UuoM1PEPr6a6Iaf4T92H+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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