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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eacc186bddb45e4bee60f55da85912bd4c510e7cf4201cbed64f45dc9da8326' 
  AND token = 'K8RyF/kJBN0o/GjlkcZKt1PPndZmYqg7uengIyh4Ejo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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