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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab22c1f945448d7e7a8d6ecdbc22eee89e22d4dcf8d1dc3a35ef06594bc6d17f' 
  AND token = 'tFxk5vnHWeRFEKsP3H21Kf99cUgSCLOD5nHgZPjAuLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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