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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a402429cc342a82cfd6e33ea1f176cc4e99681c336e2e64f28f6d20f206e99' 
  AND token = 'MXJrMk+cKllJj9u4MFMdns2ocOuX/aE8d0ifuR10ywA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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