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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e428cac164d60d902b4f01df93b11173e3050471a1afe86b60c1a0e06e984a14' 
  AND token = 'ZDewjf/Amzx0T3zybhZeukpm04dADz4xX5Wv31vJ8LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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