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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38648f9d0b539a2016a4392cdf777c20d3893541b0025ae1b149d79bdbe8bbb8' 
  AND token = 'Ex0fwmDY9XCSLvGxV+4SylemWQEc67cvhmmsI/28/pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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