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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b1778ef0b424edc8559e8aad92110542ef087e4f264fe05476504b22b91176' 
  AND token = 'Wq0G3DZ53AgtS+iXj8Xc90b3ZIMP0KU3ZIUfzu0nF78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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