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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b528ed8c1b0bfab3550549a24127ed41626a1767c807e1ac1aa32acd4e9a81f' 
  AND token = 'g9go1o0ZDFgbOYdJRMTMvr09r32BToJXFNA9AhWBqRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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