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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd174c270c4e3acb4953b6c9381970374130f57bd438e65fc50ee253cc2448907' 
  AND token = 'G0GiqNO0YGYWc8ZSCslvLeTt6uyiICaaqadAe27v/v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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