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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aad92fef93c57c2fb7e9344a6923334fec68935f783d3e6704b371a09460a91' 
  AND token = 'QbayUQsiW2PdEA7G5PxgVcbvt+2AXaR4HWZDJWN+RVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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