SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62af1e721e765aa018ce4f0310dda7edb8c23dce6f596830037d350ff27438cb' 
  AND token = 'nS+JFLOfo/mHIqZb/v0xTxHGjvar/4+VypglPjunwFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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