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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c023186a36d764fd9a5717dd85761e5a17ae407bd31ab0db59444480b8ad9b85' 
  AND token = 'bJmtPpwtSq8544f8xOlx8M2vP3B2LxJpFOjA/xCItgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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