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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e553903a9b1267aa0a1d4de7a7efb7d855690405871af7f119e0ee1d1cf8c6f' 
  AND token = '0uAbnMD9gnrp91v+A4ajJTqLplM5cWlhzf/PsofMLMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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