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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9427f7183068bda7b1e58321cbf74b45e30944bb729b6a1c86fb2943742d0e' 
  AND token = '4fp3bGvJCUx9CFzzJRWk306bnHgKkPluxk0JTKt6MQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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