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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a00a70132f6065f7cab86b4c69c12889670f647302c2f9966f4c7fa36e7d56c' 
  AND token = 'TOqwm0dBmKWNp/SPS1fgMydgC5m0kgdos3zRAgGiGLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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