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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13bc7b15e44a32d8f9dd625df7000a7508ab6f26c0b1da10f58a267e33b379c3' 
  AND token = 'zqaaZ0b0qkHsZEfw4sTFzxSOPHKXB8y7+Ztpl2nKA5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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