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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e7d8889e9bb5c72f56ecf64dbc3009e7c666714c163e750efd94e2a42aca3a' 
  AND token = '2f7xG43/kYmic2E++bZJezGIYlSYxcEoJWkWxOQX/WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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