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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283d9f7ef3ed1ed72be5a46f760666112482c81d58562386e9189ee5d6198488' 
  AND token = '3qMulgVKZWi5FF8M/nEKVqpJ9NfO20Sd5/jp5xxOP4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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