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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ed995c461278f00a7be2a0cc458eaa4fd14ff20284f4ffb4dd2559116de943' 
  AND token = '68NH+1g9IcjHyYedmdNHdm8NPb1KMAAgqGJrBKGAbTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00228

JSON explain

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