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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f0c0f3ac7e9ef92f6c40f0288866c4a5ac2b195408d3db6f60eb88490c20a28' 
  AND token = 'dOjz+mmZqOT+0r6qJ4osPgqOUG/Kw8CxfbXColmEwAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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