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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ddaebe9e9c5d3b78f475da494b833d066bce4deb8021e4c101f5a0d7ec2fb75' 
  AND token = 'UeCtBt50EvmVFJr9IMKSy55whyRtmkCLOLMncv3BEzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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