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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d364175f1160ba0750676ce456455ab13ec529f30cdfc17425f5880a9391a9a' 
  AND token = '7eHudFEzcO/9/Ulz0hJRQR/P6+L/1QyWz2kEQKv7roc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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