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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cacaef5740ed5f2787cff395b469dac5b32e54e9f59c6976aa59bbf77afee1' 
  AND token = 'LBr0bfztcm8j7zeerC7PYANVy9dYTrmSxApQMFrLw5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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