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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a5cce346257de3eca008ad39bd1c5db892033b413b3bcc5b770a4f29b2a352' 
  AND token = 'AiUWPsrLrFMpxYWK/kbMILzhCI3Zvkxn7SJucVd0oMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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