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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4fd16cd1372fec75bab968c73f562d12ee297cb7492faec83605d5f056edf22' 
  AND token = 'bEHuZtjszNCuQ/mL4AcSHv1sh3F/caVEyu8RUkgVKMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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