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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12add691f2a0586a62b8c48f3a35cdf623e72b28cea42d5394c09831d8a7e60' 
  AND token = '4xPwb5TfdTZqwnu3bs4KiNaAMsEVeeoPCEzP2BgDB/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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