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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a901d79e6765433f8c7db5704ac90e846cf114d669d7448d759de642c9ce2a26' 
  AND token = 'Pof7oyPkQ9OzGy6sHcQyZHJDY9Mc5raJDHOtEeYOqu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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