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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5620de471c386e43234bc15d3d83cf9e53a839c1f2b63857c6abce3f44dbaadf' 
  AND token = 'X2CLw//R8XOHV6PtLHTtOi+LncZB7T7X3keUsGGN28M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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