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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '069e8254d833fb77be4f68dc13d0ea9859bdee3406187b784f966d36191c1b81' 
  AND token = 'BH+OZabEDz0lffedL/dMUrpd0k2cBdXG/8iMA8IP9Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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