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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba19fe59bdf8059fb891034492ff1e96703b8fcc162d6a8cac7cb0540f5e33d' 
  AND token = 'NROgU5wcwjDZRGlAubCkycfTY9m9OiLlh19dI+XyYfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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