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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '623c48b2a1eeb330bce438978a2793fd241066694f08acebf76d5602c96d28c7' 
  AND token = 'jfFfkOPdlhZaG9axqjwBEHlTPPJoXb3yhhtqy3T9V2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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