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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c86418bcd4d3d1d292787268e769a1568b00fd9a2130701893e99170f32f20af' 
  AND token = '5kLqZskWkJgI/e2z2UMXi97qG3fszGOlg6A/u+xEzuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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