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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99b682c4217b6a9193d1d3872e939f5972f7bd81aff622553af15e4ddd8c547' 
  AND token = '7Gsdl7VwZg2/ZNFNxbHmcQJbXioJmNONbvncoH1nffg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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