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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9e94684286f612219931fe6de47998f73a84069103a64cf318ebaf53cca1d4' 
  AND token = 'Iti7yALH6HSBMczAksBwfNlZ5rb5CgNYF2ovtN2sfXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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