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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb093b5bb9e22a0c62e02d57830a111bbb75b62d8b10aae7fb7d97a8dd765e98' 
  AND token = 'oVdFft6aL8omW357ZM7gBTsqqsBbXCDNeiLupalbPjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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