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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b37b158d68f71a4e30d01a37a1c9f9222e00cd67a5bc5bacaf1ae5fe7f6e634d' 
  AND token = 'Zgx6sVxg1HkKufP4e9tcbCj/m2XwwE/fTgxR6dk6Ss0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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