SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1979dae7c2ec4152721f1dbb1ec18bbaa88740183f636f32e3c93d3bdcf8dc87' 
  AND token = 'lY6TfVKerozvV+BGNH84mrEOOMFdXwX0sS4pi/UUAvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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