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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f3ba9bb460c4f32759de9c776e4afdf58857023247d52410130678c0d5dbf2' 
  AND token = '6b5LaaRkIThyfL6kyIjORKH6cvMW8Hp37U4Dm1PkMXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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