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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c039c75ec9df8a9adf070862b0985c6d6ba41a1083ea4ffb141b6fd4e30b52f' 
  AND token = 'xMzinH6MZX28802NgkIhBqIuqYayqE+oir7yuu3zz5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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