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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636a5bec4d0ce64a20189686fc531bff8bdc8a02dabd60b8640c6f2e227c8b92' 
  AND token = 'O/JTcGwSrGvAsuoS3AASt+dwkQZFK9cwTW+IozgRvBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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