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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce5fab4f0e9dae6750003483f26bd4c2131df835a1f729a0a1bfb04e714d28b' 
  AND token = 'qub8mLjm7aEaAsvmUww2h+7+5bj3se0OV+tUnqffOZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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