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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '578657970ffbfa5516d9d9cb78b5955db7ab03944b60c3fb16f8cd52cfe71b47' 
  AND token = '7i8QGlVKuyuxg4dzFx0B45U4HNTQ3eWA1mi55MwtYkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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