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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06600bee4cfe5ade7b58e09e87d29052c450570ef742b222d3a98d79b7daa14c' 
  AND token = 'DY330DRdYJWNQR8Bih23b+unflaeTUJ1HJVlpnBB05k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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