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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7b5099410e710d325ea7f264838e7e7ced15d264b23607097cab6b3d3e68b7' 
  AND token = 'xbSyFIyQXHim+d0NTiZoC3YE0ITJMa5XleKes/5CwAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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