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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70dd4a4ac78643108ff730710e5b606c487cb58f51325cb9c39fafd33e4c9797' 
  AND token = 'Bn8bT1/TsUno/VUnbxDBvGcntKy0lrCYo6+MMWHquOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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