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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fddb4a9d1d7ef09614e775ed9a4ec34548b409130ab0a9ef7f2199fe4a16926d' 
  AND token = 'IKQbrE+lcJNzn2LlvhYWyH2s/gjtm6geRFLKPiFbQMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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