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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b5220d472e858d5d2a5d08a4d7f0dfd4a51a37c58743fdba2673d81617ba63' 
  AND token = 'ulf+3SE94kogNk3KK4nWN5pHrViXB/5uHRaqy4tpIxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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