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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9eada47e07832c939989587279eb2f00c7f7e407f9e8ba5f98f13c6eec6f805' 
  AND token = 'V6mOJZr2lNzn6KEHYKO3et41stb8AB9XNkIJSo1coig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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