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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee9c1ad07676816daf8891fd160c7d8c92ef85cddbd5b56e3e357be6055a358' 
  AND token = 'NoS196UeH0bWKM8RJBJ0e7TbD0lYwWCBbwss2MNVMF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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