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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2554de4d8115c969c699afff16419decf04d67c6e5ca6d334c0848b6b59959d9' 
  AND token = 'MEB2njzZv2k5n5GEpqTy5Bd6X9n+uZ6oyvxG3dJa8So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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