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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee31466af7b90662c2576fe10cc778a03be518c5fd1ac5c681f126c099ac27d' 
  AND token = 'cN7X8OGTfD3EFSqFCBfmIqbLpk2m5mkdsFGeoby9oyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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