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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5af992f7a51f48ccc62169a6caefda49e215582a7038f521e7d414ff6dfa3324' 
  AND token = 'XMtHLQFe6ZEmHGki+1Jp9YhI90wrkqc7A6rUYYO7qHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

JSON explain

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