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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae3d38de104a033c2897e99f9dcc589cd6ac848b8f35e6e799b920030e55c08' 
  AND token = 'LeUorBvfv+UdF74zEt4O4jxM6MxkZy0zKPEnu59QI6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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