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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad47f2ce2991799ca54b477fef32e8df80946f37d7422fbdd49168338e3c6822' 
  AND token = '2bmGG/58BTcaTdfj+hjqIjWbNJbDhKk2OX8mSiKJnUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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