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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6291dcabae9c57f90aa86ff11fef4907fd36f93b08c8cdb620c22df768465074' 
  AND token = 'yyut6QF80xXlAg4huyyUUm+h1o0Zyda+m75ILQTWOkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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