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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847921bbfdd684662a8db3c36f1c3151e19fc377fb4025144a45269be1c92c4d' 
  AND token = 'dGh7TM+vKr5bDKN0Fy8YZlkzdb5wvF0mDbdUn5fU7D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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