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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e2dade5378bca0d7359f07333943da56b8da9a9627d1ed0922218d8ec60d12' 
  AND token = 'v7a99v0n0oPGiMcZ7ZBQ/nMlWpUW55lgf8UVsGyt2dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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