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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd8d739914c9382d683b25a9ce42c4014869ccb73cff0ff0ae247163f4b0af4' 
  AND token = '9uh3oN23wMzIUU8W0NxOS7osbci1/LwwjKKZVHsDkWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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