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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f107dc41affad322e3621445a3e9dc64003d25a3d843c227154babbeb8bd84' 
  AND token = 'TfJa0RqOwrM3HqLMic70bYh+9X9tYNBcXfJjKwjwvCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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