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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7bea8c75f1eebd2c8c4ecec1bd59d70deff466d5444ded65f5a6c74341f96b9' 
  AND token = 'V3Fc4rIUCHd9QWXAn5Bo4FJenXvi7ef6Bl8rsTmbr1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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