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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78f93149792171fc210218d285df6a6430d7901f4225d8cdc6a5f09f3c3081a2' 
  AND token = 'p62Jt6p3OJTRmdKIcdeUnVN4WzFY9MzJWRxMctJ5ezo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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