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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '414e1624ff7b25832316f255f9f5a3e810a7fe60643e21aef2b6920f0ae04a7e' 
  AND token = 'X/p7d6Y3avNsoD7sx8WO5J+YWLaCTx/+y5Pa5NN5nGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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