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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5b4083fd2180f359aaf23fc8d07c6e5bafcd58fc1b2598056a5880152c61d96' 
  AND token = 'Lyv2vnzhH97MVHUJu0tpY+26v47sT9plQwK2+32EM0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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