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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34e4f62e56af1c93b15ae07bf264748fcccdf89b18b8360831aca9c0af2bec0' 
  AND token = 'rx3xkkdnydWhMwcpRz9QSNca/bAFh8rieTg27yDfVyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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