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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b678626d5a08e2baf00ae227f0259bdf1360c3e01014dd8c556f27872df65add' 
  AND token = '+1gfRW18a3JcolUUwCMcBAtKn/4G0f/aVXsq9mDbj/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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