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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3be34c7b3a1dd0f1c8711e8c535dab3780f555cde6b93846f7b10f6dcc9a1eaa' 
  AND token = 'Vu4/XNXaU/7lZkcIYtlhBQAJw5ngukyM/aDsdH0JxL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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