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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03df8cd489cf15cb2c4c8bc3716eee91759a5efc0d7ce3b35b8c59d4e3386da' 
  AND token = 'uIYTPrDHfuMf6Dyv7v3s+f+aTCJj2FyrBrfvfUkIBhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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