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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09f5f2c9d50b876eed9a11c252ffb1edafed92c9b502abadbaa1bb9027c277f' 
  AND token = 'jaU+DFoVrcF/y8kWgTaFPLJ65/Gi27MZvV2XYD6MNvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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