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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa86e65e47dd46d18a51159269c8e5c7986547ae0fa9c2a3a9b494bb79c0e1c' 
  AND token = 'YgV/yK9EyILx9jxBkG5EmQRZMK5654L1aLj0lqBlf18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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