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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b41ce3c17f6aecd1661a7594bc9fb11393cdc7866134f51de9c32f3257e17c50' 
  AND token = 'M/A6KcS6eWG0rl1y4tMlFkKfA7/r13ZCZ4yb2e8sxOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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