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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '473511bca538ba3c75a28f16c06ed9a7bc06103e48cd5b01c8d499a5dba94998' 
  AND token = 'PuQL8C1+GjCBDyigO+iLO5dxvbffFmoaSdu7QBbulgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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