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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39a4f5cdf72c65cb5df0aa5b318614ca0aa2d34cd165b711d4fc5d3422cecb57' 
  AND token = 'i7eCuKV1wa9edt80VdGi9N90pVdzej5KdSijs8ysWvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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