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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ec2884fda16bbaaa62ee6171bf183fc1038a4ab06681b3164c3999aa91f0df' 
  AND token = 'JB4M8Tz+ntNh1wZtzoKVR/NSDnYtFBPS/d2guX/K4yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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