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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54490862d18c24512ee0d74356e7680d10b9c0706737a8e7453bc52ca263999d' 
  AND token = 'qEPmYY+/7Zc180WoXRp2HgDpS4+xMWCrnDo7u2wiu6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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